DCWW2115 Service Reservoir Cleaning, Maintenance and Refurbishment CoP
Dwr Cymru Cyfyngedig (DCC), a Welsh water and wastewater utility, is procuring a framework for cleaning, inspection, maintenance and refurbishment of its potable water service reservoirs. The supplier will clean and disinfect approximately 828 tanks using appropriate methods and Drinking Water Inspectorate (DWI)-approved products, inspect reservoirs, and undertake minor planned, reactive and emergency remedial works such as concrete and steel repairs, coatings, membranes, ladders, pipework, joints and external earthworks, supporting the safe return of assets to service. The framework has an estimated value of £25.5 million for an initial three-year term, with options extending the maximum duration to eight years and the total potential value to £68 million. Services will be delivered across DCC’s operational area, covering underground and above-ground steel or concrete tanks and a small number of water towers. The critical requirement is that cleaning and disinfection activities use DWI-approved products and comply with DCC’s PNL 810 standard, DWI requirements and applicable water-quality legislation.
Buyer: Dwr Cymru Cyfyngedig. Source: Find a Tender. Updated 6 Oct 2026.
Key facts
- Estimated value: £25.5m
- Bids close: 2 Nov 2026
- Location: Cardiff and Vale of Glamorgan
- Procedure: Competitive flexible procedure
- Contract period: 15 May 2027 to 15 May 2030
- Category: Tank and reservoir cleaning services (90913000)
From the official notice
Overview And Objectives DCC intends to award a Framework Agreement for Service Reservoir Cleaning, Maintenance and Refurbishment services. It is a business-critical service required to: • maintain the cleanliness, integrity and operational condition of DCC’s potable water storage assets; • support the safe and timely return of service reservoirs to operation following planned cleaning, inspection and minor remedial works; and • support compliance with Drinking Water Inspectorate (DWI) requirements, DCC’s internal standards and applicable water quality legislation. The Framework will be used to provide cleaning and maintenance for potable water tanks across DCC’s operational area. There are approximately 828 tanks within DCC’s estate that require routine cleaning and inspection in accordance with PNL 810 (DCC’s internal standard for drain downs and cleaning of service reservoirs) to meet Drinking Water Inspectorate (DWI) regulations. Tanks include below ground and above ground steel or concrete tanks as well as a small number of water towers however most tanks are square, underground concrete structures. Ensuring a clean and consistent water supply is core to DCC services and is linked directly to corporate key performance indicators. The proposed contract term is 3 years, with the option to extend for a further 5 years (2 + 2 + 1 years). The estimated value of the framework for the initial three-year term is £25.5 million based on estimated annual expenditure of approximately...
View the official notice
Questions about this tender
When is the deadline?
Bids close on 2 Nov 2026.
What is it worth?
The estimated value is £25.5m.
Who can apply?
The buyer has marked it as suitable for small and medium-sized businesses.
How do I bid?
Open the official notice, register on the buyer's portal and submit your bid before the deadline.
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